Machine for simultaneously forming independent stitched seams



K. MAIER Feb. 13, 1934.

MACHINE FOR SIMULTANEOUSLY FORMING INDEPENDENT STITCHED SEAMS Filed Jan. 25; 1928 2 Sheets-Sheet Feb. 13, 1934. K, MMER 1,947,299

MACHINE FOR SIMULTANEOUSLY FORMING INDEPENDENT STITCHED SEAMS Filed Jan. 23, 1928 2 Sheets-Sheet 2 Patented Feb. 13, 1934 MAGHINE FOR SIMULTANEOUSLY FORMING ENDEPENDENT STITCHED SEAMS Karl Maier, Stuttgart,

Germany, assignor to Union Special Maschinenfabrik, G. m. b. H.,

Stuttgart, Germany 2 Claims.

The invention relates to improvements in sewing machines, the object being to provide a machine having independent stitching devices to form independent stitched seams at the opposite sides of a central fabric section to be connected to two side fabric sections, said central section being positioned. so as to encircle the support therefor. The invention is illustrated in the accompanying drawings, in which Figure 1 is a front view showing more or less diagrammatically a portion of a machine for carrying out the invention.

Fig. 2 is a side view of the same.

Fig. 3 is a plan view of the parts shown in Fig. 1 with fabric sections being fed to the machine.

4 is a plan view of the throat plate also showing the feed dogs.

Fig. 5 a sectional view through the presser foot on the line AB of Fig. 3.

Fig. 6 is a diagrammatic view showing one form of the finished article.

Fig. '7 is a view showing the arrangement of the fabric sections for forming the article shown in Fig. 6.

Fig. 8 is a view similar to Fig. 7 but showing the edges of the central fabric section turned back to form a hem.

Fig. 9 is a view similar to Fig. 8 showing the edges of the fabric sections interfolded.

Fig. 10 is a view similar to Fig. 'I but showing the outer fabric sections as folded back and stitched.

Fig. 11 is a view similar to Fig. 7 but showing the fabric sections and edge portions thereof folded in a different manner.

The machine includes two independent stitching devices for forming independent stitched seams. Associated with these stitching devices is a work support which is preferably cylindrical. The central section of fabric which is to have the independent stitched seams formed at the opposite edges thereof is placed about the cylindrical work support so as to be fed endwise thereof either onto the cylinder or off from the end thereof.

A presser foot is provided for holding the fabric in proper relation to the feeding mechanism and the work support for the fabric. Associated with the stitching mechanisms is a guide for guiding the edge portions of the fabric sections being stitched. The central fabric section is placed about the cylindrical work support and the edges brought to a position where they face each other and pass along this central guide. Thus it is that the opposite edges of the fabric section are presented to the two independent stitching devices so that independent seams may be formed in the edge portions of the fabric section. The needles are set of course at a fixed distance apart in the machine. The distance between the finished stitched seams however may be many times the distance between the needles for the reason that the fabric section extends from one needle around the work support to the other needle. It may therefore be made a size so as to freely slip onto the work support, or it may be made very much larger than the circumference of the work support. The presser foot may also be provided with hemmers for hemming the edges of the fabric section.

The essential features of the machine include the arrangement of the stitching devices and the guides for the fabric section so that the fabric section may be presented to the stitching devices for the simultaneous formation of the independent seams with the fabric section encircling the work support.

Referring more in detail to the drawings, the machine includes a cylindrical work support 1 above which is the usual needle head 2 in which is mounted a presser bar 3. The machine includes a needle bar 4 carrying needles 5 and 6. These needles are elements of two independent stitching devices which form independent lines of stitching. It is not thought necessary to illustrate the complemental stitch forming devices.

The work support 1 is provided with a throat plate 7 having feed slots formed therein in which the feed dogs 8. 8 are operated for feeding the material longitudinally of the cylindrical work support. The openings for the needles are shown at 5 and 6 respectively in i. It will be noted that the feed dogs are so shaped as to operate on the fabric section outside of the needles and in rear of the needies. In a sense these feed dogs are right and left hand. This is for the purpose of feeding the edge portions of a fabric section wherein the edges of said portions are spaced from each other and face each other. In other words, the extreme edges of the fabric section being stitched both pass between the needles.

The material is held on the work support by a presser foot 9. The presser foot 9 is provided with two fabric engaging sections 11, 11. These sections are carried by supporting posts 10 respectively, and a spring 12 for each post is attached to the shank of the presser foot and bears on the post supports so as to yieldingly depress the same. Thus it is that the presser foot is formed with two fabric engaging sections which may yield independently of each other and thus accommodate the independent edge portions of the fabric sections passing beneath the same.

Each presser foot is also provided preferably with a hemmer or fabric directing member 13 which infold the edge portions of the fabric sections. Directly in front of the presser foot and located in a plane passing centrally between the needles is a guide 14, which is secured to the end of the work supporting cylinder. This guide 14 separates and guides the edge portions of the fabric section so as to insure that they shall be spaced from each other and that the lines of stitching formed by the stitching devices will produce independent stitched seams.

In Figure 6 of the drawings I have shown more or less diagrammatically an article which is stitched on my machine. This article includes a central fabric section 17 to which is stitched at one edge thereof a fabric section 18 by means of a stitched seam 19. A fabric section 20 is stitched to the opposite edge of the fabric section 17 by an independent stitched seam 21. To form this article the central fabric section 17 is placed about the cylindrical work support 1 so that it substantially encircles the same as shown in Figure 7. The edges of this fabric section are spaced from each other by the guide 14. No hemmers are used and the edge portions therefore lie flat separated and with the edges facing each other as stated. The fabric section 18 is guided beneath the presser foot with its edge portion superimposed upon the edge portion of the fabric section 17 with their edges substantially in line. The fabric section 20 is directly beneath the presser foot at the other side thereof with its edge superimposed upon the opposite edge portion of the fabric section 17. The needles pass through the respective superimposed edge portions of the fabric sections thus forming the independent seams l9 and 21. It will be noted that the fabric section 17 may be made of any desired width provided it is wide enough to encircle the work support 1. The width of the section 17 may vary. The essential feature consists that the edge portions shall be brought together alongside of the guide 14 and thus directly beneath the presser foot so as to produce the independent seams.

In Figure 8 of the drawings the edge portions 22 of the fabric section 17 are folded back onto the edge portions of the fabric sections 18 and 20 respectively. While these edge portions of the fabric section 17 are folded back the edges of the folds thus formed are spaced from each other and face each other.

In Fig. 9 of the drawings the fabric sections are shown as interfolded at 23. This may be accomplished by suitable folders carried by the presser foot. Here again the edges of the folds are spaced from each other and face each other so that the central fabric section may be presented to the stitching devices with said fabric section encircling the work support.

In Fig. 10 each fabric section 18 and 20 is folded back upon itself so that its outer edge portion is superimposed upon its inner edge portion and joined to the fabric sections when the independent stitched seams are formed.

In Fig. 11 a still further modified form of presentation of the fabric sections is shown. In this view the central fabric section has its edge portions turned under and one of the fabric sections is folded intermediate its side edges. Other ways may be found for presenting fabric sections, and a single fabric section may be stitched without any outer fabric sections, and thus the edge portions of the central section finished in any desired way. One section alone may be stitched to this fabric section which encircles the work support. The essential feature of the machine is the presentation of a central fabric section regardless of how its edge portions are treated so that independent stitched seams may be formed at the outer edge portions thereof simultaneously and in such a way to the independent stitching devices that it may be of substantially unlimited width.

It is obvious that minor changes in the details of construction and the arrangements of parts may be made without departing from the spirit of the invention as set forth in the appended claims.

What is claimed as new is:--

1. A sewing machine including in combination, a suspended cylindrical work supporting 105 arm, two stitch forming devices for forming independent lines of stitching, said stitch forming devices being located relatively close together,

a guide located in advance of the stitch forming devices for separating the edge portions of the 110 fabric sections presented to said stitch forming devices, a fabric directing member at each side of said guide for receiving and directing the edge portions of a fabric section encircling the work arm to the respective stitch forming devices and 116 for receiving and superimposing on each edge portion the edge portion of an independent fabric section and directing the same to the respective stitch forming devices.

2. A sewing machine including in combination, 120 a suspended cylindrical work supporting arm, two stitch forming devices for forming independent lines of stitching, said stitch forming devices being located relatively close together, a guide located in advance of the stitch forming devices 125 for separating the edge portions of the fabric sections presented to said stitch forming devices,

a fabric directing member at each side of said guide for receiving and directing the edge portions of a fabric section encircling the work arm 180 to the respective stitch forming devices and for receiving and superimposing on each edge portion the edge portion of an independent fabric section and directing the same to the respective stitch forming devices, said members for receiving and directing the edge portions of the fabric section encircling the work arm including means for folding said edge portions back on the respective edge portions of the fabric sections which are being joined thereto.

KARL MAIER. 

